A few months after some convention attendees had their data compromised, the Boston Convention & Exhibition Center will play host to a special conference in March that will focus on data theft and on how businesses can protect the credit card data of their customers, the Massachusetts Convention Center Authority said Monday. Attendees of the March 5 event will include officials from the state Attorney General’s Office, the Executive Office of Housing and Economic Development, the Boston Police Department, and the US Secret Service, as well as experts within the payment card industry, said the authority, which manages the Boston convention center. A goal of the conference is to provide attendees from the hospitality industry with “up-to-date information on this growing threat,” the convention authority said.